User`s manual

Version 5.4 151 May 2008
SIP User's Manual 3. Web-Based Management
Parameter Description
Proxy DNS Query Type
[ProxyDNSQueryType
]
Enables the use of DNS Naming Authority Pointer (NAPTR) and Service
Record (SRV) queries to discover Proxy servers.
 [0] A-Record = A-Record (default)
 [1] SRV = SRV
 [2] NAPTR = NAPTR
If set to A-Record [0], no NAPTR or SRV queries are performed.
If set to SRV [1] and the Proxy IP address parameter contains a domain
name without port definition (e.g., ProxyIP = domain.com), an SRV query is
performed. The SRV query returns up to four Proxy host names and their
weights. The device then performs DNS A-record queries for each Proxy
host name (according to the received weights) to locate up to four Proxy IP
addresses. Therefore, if the first SRV query returns two domain names, and
the A-record queries return two IP addresses each, no additional searches
are performed.
If set to NAPTR [2], an NAPTR query is performed. If it is successful, an SRV
query is sent according to the information received in the NAPTR response.
If the NAPTR query fails, an SRV query is performed according to the
configured transport type.
If the Proxy IP address parameter contains a domain name with port
definition (e.g., ProxyIP = domain.com:5080), the device performs a regular
DNS A-record query.
If a specific Transport Type is defined, a NAPTR query is not performed.
Note: When enabled, NAPTR/SRV queries are used to discover Proxy
servers even if the parameter DNSQueryType is disabled.
Subscription Mode
[SubscriptionMode]
Determines the method the device uses to subscribe to an MWI server.
 [0] Per Endpoint = Each endpoint subscribes separately - typically used
for Mediant 1000 FXS interfaces (default).
 [1] Per Gateway = Single subscription for the entire device - typically used
for Mediant 1000 FXO interfaces.
Use Gateway Name for
OPTIONS
[UseGatewayNameFo
rOptions]
Determines whether the device uses its IP address or gateway name in
keep-alive SIP OPTIONS messages.
 [0] No = Use the device's IP address in keep-alive OPTIONS messages
(default).
 [1] Yes = Use 'Gateway Name' (SIPGatewayName) in keep-alive
OPTIONS messages.
The OPTIONS Request-URI host part contains either the device's IP address
or a string defined by the parameter SIPGatewayName. The device uses the
OPTIONS request as a keep-alive message to its primary and redundant
Proxies (i.e., the parameter EnableProxyKeepAlive is set to 1).
Number of RTX Before
Hot-Swap
[HotSwapRtx]
Number of retransmitted INVITE/REGISTER messages before call is routed
(hot swap) to another Proxy/Registrar.
The valid range is 1 to 30. The default value is 3.
Note: This parameter is also used for alternative routing using the 'Tel to IP
Routing' table. If a domain name in the table is resolved into two IP
addresses, and if there is no response for HotSwapRtx retransmissions to
the INVITE message that is sent to the first IP address, the device
immediately initiates a call to the second IP address.